See then and now photos of legendary bikini models, from their SI Swimsuit Edition bikini bodies to today

Heidi Klum is the definitive hot bikini model. The German beauty was a fan favorite in Sports Illustrated's Swimsuit Edition and one of Victoria's Secret's most famous Angels. Here, Heidi walks the runway at the 2003 Victoria's Secret Fashion Show.

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Bikini Models: Heidi Klum Then

Heidi Klum is the definitive hot bikini model. The German beauty was a fan favorite in Sports Illustrated's Swimsuit Edition and one of Victoria's Secret's most famous Angels. Here, Heidi walks the runway at the 2003 Victoria's Secret Fashion Show.

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Bikini Models: Heidi Klum Now

Heidi Klum's career just won't stop. The mother of four is the host, judge and executive producer of Project Runway and has her own line of jewelry, as well as various clothing lines and fragrances. Still, Heidi manages to stay in amazing shape, and she is fighting to end heart disease, too. Check out our exclusive Q&A with the multitasking model.

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Bikini Models: Naomi Campbell Then

Naomi Campbell was one of the most recognizable faces (and bodies) during the supermodel era of the early 90s. Discovered at the age of 15, the British model worked the runway (seen here in a bikini from Chanel's 1994 ready-to-wear collection), starred in numerous music videos and broke fashion's color barrier by being one of the first black models to make the cover of many magazines.

In 1989 Kathy Ireland appeared on the cover of SI's most popular Swimsuit Edition ever—which is why she was featured in 13 consecutive issues after that. The California native started an acting career in the late 80s and founded Kathy Ireland Worldwide in the early 90s. Here, Kathy shows off the 1998 version of her bikini body.

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Bikini Models: Kathy Ireland Now

The success of Kathy Ireland Worldwide (the company brings in a reported $1.5 billion each year) prompted Forbes to call Kathy the "prototype for model-turned mogul." Kathy is also the author of six books, including one about her 25-pound weight gain and loss. Kathy's not the only celeb who has transformed her body. See more of Hollywood's most dramatic before and after photos.

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Bikini Models: Molly Sims Then

Molly Sims started her modeling career later than most of the bikini models featured on our list, but we couldn't leave out this Kentucky native's perfect beach body. In 2000, the former host of MTV's House of Style made her first appearance in SI's Swimsuit Edition. Molly is seen here at MTV's Fashionably Loud presents the Sports Illustrated 2002 Swimsuit Issue - Show.

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Bikini Models: Molly Sims Now

Molly Sims made a smooth transition from modeling to acting and went on to star in all five seasons of NBC's Las Vegas. Molly added designer to her credentials in 2010, launching her own jewelry line. The 37-year-old works out with celeb trainer Tracy Anderson to stay in amazing shape. Steal the best stay-fit tips from more of Hollywood's top trainers.

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Bikini Models: Rebecca Romijn Then

Rebecca Romijn began her modeling career in 1991, working the runway and starring in ad campaigns for Victoria's Secret. The blonde bombshell was on the cover of the 1999 SI Swimsuit Edition. Here, Rebecca Romijn poses for a 'Got Milk' ad in New York's Time Square in 1998.

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Bikini Models: Rebecca Romijn Now

Rebecca Romijn's successful acting career almost makes us forget that it wasn't her first job. The wife and mother of two starred in three X-Men movies (2000, 2003, 2006) and was nominated for a Screen Actors Guild award for her role on ABC's Ugly Betty. Rebecca takes long hikes and bike rides with her family. If you like being active with your family, consider one of these four fit getaways.

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Bikini Models: Christie Brinkley Then

Christie Brinkley's 20-year contract with CoverGirl is the longest in modeling history. The California surfer girl has appeared on more than 500 magazine covers, including SI's Swimsuit Edition for three consecutive years (1979, 1980, 1981). Brinkley is seen here in 1983 in a still from National Lampoon's Vacation.

Tyra Banks signed her first modeling contract at age 17 and then booked a record 25 fashion shows during her first week in Paris. Tyra was the first African American to appear on the cover of GQ and the SI Swimsuit Edition. Here, Tyra walks the runway in the 2003 Victoria's Secret Spring Fashion show.